Electrochemistry and ion concentration, Chemistry

Assignment Help:

ELECTROCHEMISTRY AND ION CONCENTRATION

Activity dependence of cell voltage:

Measurement of galvanic cell potentials away from the standard state provides a convenient method for measuring ion activity and activity coefficient. As ion concentration is varied in a half-cell to vary ion activity. Equilibrium position of the half cell reduction reaction changes and that causes a change in the half-cell potential. The relationship between the activity and half-cell potential is given by the Nernst equation:

890_electrochemistry.png

for the general half-cell reduction reaction:

 aA+bB+ne-→cC+dD

Cells at equilibrium:

When a cell is at equilibrium, Ecell=0 (the 'flat battery' condition) and Q=K, the equilibrium constant for the reaction (see Topic C1). This gives the expression: which allows calculation of equilibrium constants (see Topic C1) for cell reactions from calculated or measured values.

 

199_electrochemistry1.png

which allows calculation of equilibrium constants for cell reactions from calculated or measured 1046_electrochemistry2.png values.


Related Discussions:- Electrochemistry and ion concentration

Storehouse of minerals, Q. Storehouse of minerals? in addition to the e...

Q. Storehouse of minerals? in addition to the earth's crust, oceans also provide a huge storehouse of minerals in which the metals occur primarily as soluble sulphates and hali

Explain preservation by preservatives, Q. Explain Preservation by Preservat...

Q. Explain Preservation by Preservatives? Preservatives, as you may already know, belong to a class of food additives that extend shelf life by inhibiting microbial growth, o

Henderson-hasselbalch equation, (a) Explain in terms of ionic equilibria wh...

(a) Explain in terms of ionic equilibria why the aqueous solution of a salt derived from a weak acid and a strong base (e.g. sodium phenolate) has a pH greater than 7. (b) B

Catalyst, How sodium carbonate can increase surface area of a catalyst

How sodium carbonate can increase surface area of a catalyst

Many ionic crystals dissolve, Many ionic crystals dissolve in water because...

Many ionic crystals dissolve in water because: (1) Water is an amphiprotic solvent (2)Water is a high boiling liquid (3) The process is accompanied by a positive heat of

Electrodic potential, calculate the electrode potential of a platinum elect...

calculate the electrode potential of a platinum electrode immersed in a solution containing Ce4 + ions (cCe4 + = 0.05M) and Ce3 + ions (cCe3 + = 0.1M)

Define the normality of solutions, Q. Define the Normality of solutions? ...

Q. Define the Normality of solutions? Ans. Sometime normality is used to measure concentration. Normality (abbreviated N) is the number of gram-equivalent masses of solute in 1

Chemical kinetics, #question.affect of solvent on rate reaction

#question.affect of solvent on rate reaction

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd